Ordained a deacon by Pope Liberius, he was elected as Pope St. Damasus I’s successor in December 384. His famous letters—the earliest surviving texts of papal decretals—focus particularly on religious discipline and include decisions on baptism, consecration, ordination, penance, and continence. Siricius’ important decretal of 386 (written to Bishop Himerius of Tarragona), commanding celibacy for priests, was the first decree on this subject and has remained in force ever since the pontificate (440–461) of Pope St. Leo I the Great. Significantly, Siricius asserted papal authority by accompanying his decretals with threats of sanctions against those who contravened them; his letters designate the pope as a sovereign of the whole Western church, for which he makes laws. He also decreed that no bishop should be consecrated without the Apostolic See’s knowledge.

Likewise, Siricius believed he was entitled to intervene in the affairs of the Eastern church. At the request of Bishop St. Ambrose of Milan, he became involved with settling the Meletian Schism, a complex situation involving the disputed bishopric of Antioch. His instructions to the Council of Caesarea (393) for recognizing Flavian I as the legitimate Antiochene bishop terminated the long-standing schism. He arbitrated in 394 in a dispute within the Arabian church on the bishopric of Bosra (Bostra).

A column still surviving in the Basilica of St. Paul Outside the Walls, Rome, commemorates Siricius’ dedication (390) of that church.

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the state of being unmarried and, therefore, sexually abstinent, usually in association with the role of a religious official or devotee. In its narrow sense, the term is applied only to those for whom the unmarried state is the result of a sacred vow, act of renunciation, or religious conviction....